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Revenues - Activities and Ending Reserve Balances for Significant Categories of Discounts and Allowances (Details)
$ in Thousands
 3 Months Ended
Mar. 29, 2019
USD ($)
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]  
Balance at December 31, 2018 $ 17,276
Provision related to sales made in:  
Current period 43,933
Prior periods 236
Payments and customer credits issued (39,629)
Balance at March 31, 2019 21,816
Chargebacks and Discounts for Prompt Payment  
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]  
Balance at December 31, 2018 2,322
Provision related to sales made in:  
Current period 27,153
Prior periods 0
Payments and customer credits issued (27,367)
Balance at March 31, 2019 2,108
Other Customer Credits/Fees and Co-pay Assistance  
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]  
Balance at December 31, 2018 3,038
Provision related to sales made in:  
Current period 3,875
Prior periods 9
Payments and customer credits issued (4,189)
Balance at March 31, 2019 2,733
Rebates  
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]  
Balance at December 31, 2018 11,916
Provision related to sales made in:  
Current period 12,905
Prior periods 227
Payments and customer credits issued (8,073)
Balance at March 31, 2019 16,975
Returns  
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]  
Balance at December 31, 2018 0
Provision related to sales made in:  
Current period 0
Prior periods 0
Payments and customer credits issued 0
Balance at March 31, 2019 $ 0